<!DOCTYPE HTML>
<html>
<body>
<style>
a {
  position: absolute;
  width: 10px;
  height: 10px;
  top: 0;
  left: 0;
  background: blue;
}
f {
  position: fixed;
  width: 10px;
  height: 10px;
  bottom: 0;
  left: 100px;
  background: lime;
}
fieldset {
  -moz-columns: 2;
  -moz-column-fill: auto;
  border: 1px solid;
}
.rel {
  position: relative;
}
</style>
<fieldset class="rel" style="overflow:hidden; width:300px; height:200px;">
  <legend>Legend</legend>
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
<a></a><f></f>
</fieldset>
<fieldset class="rel" style="-moz-columns: 3; -moz-column-gap:2em; -moz-column-rule:3px solid; -moz-column-width:3em; width:600px; height:7em">
  <legend>Legend</legend>
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
  <p>X
<a></a><f style="left:120px"></f>
</fieldset>
<fieldset style="overflow:hidden; width:300px; height:2em;">
  <legend>Legend</legend>
  <p>X
<a></a><f style="left:140px"></f>
</fieldset>
<fieldset style="width:600px; height:2em">
  <legend>Legend</legend>
  <p>X
<a></a><f style="left:160px"></f>
</fieldset>

</body>
</html>
